Since you are asking only 2-3 questions, I assume that you know everything else about these. If not, I am familiar with them somewhat from research years ago, and could ramble on quite a bit-ha! If I could examine the paper and ink, I could answer your questions but without that, I could only say that I believe that the 4th image, in Nuremburg, is original. The 2 caricatures were originally 8.25" x 7" & were re-issued at least once that I know of, at 19" x 12.25" in the 1880s. The ULFT seems to be floated on another paper and uneven, bending the light in the photo, making it too difficult to read the name. Research would tell how many re-issues of any of these that there are. A quick way to eliminate some of the mystery is to use a magnifying glass to see if any are modern lithographs, rather than engravings or etchings, as they should be, or different sizes. If that is not the case, then you research the different "states" of the engravings pulled and any done by a different hand or at a later date. Hope that helped; Good Luck!